CN1035792C - Optical disc, device for checking optical disc and device for recording information on optical disc - Google Patents

Optical disc, device for checking optical disc and device for recording information on optical disc Download PDF

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Publication number
CN1035792C
CN1035792C CN94104669A CN94104669A CN1035792C CN 1035792 C CN1035792 C CN 1035792C CN 94104669 A CN94104669 A CN 94104669A CN 94104669 A CN94104669 A CN 94104669A CN 1035792 C CN1035792 C CN 1035792C
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China
Prior art keywords
signal
pit
irregular
string
irregular pit
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CN94104669A
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CN1100549A (en
Inventor
尾崎和久
茅沼完治
长野博文
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Victor Company of Japan Ltd
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Victor Company of Japan Ltd
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Priority claimed from JP5207136A external-priority patent/JP2806219B2/en
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00572—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium
    • G11B20/00586—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium said format change concerning the physical format of the recording medium
    • G11B20/00594—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium said format change concerning the physical format of the recording medium wherein the shape of recording marks is altered, e.g. the depth, width, or length of pits
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00572—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium
    • G11B20/00586—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium said format change concerning the physical format of the recording medium
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00572—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium
    • G11B20/00586—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium said format change concerning the physical format of the recording medium
    • G11B20/00601—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium said format change concerning the physical format of the recording medium wherein properties of tracks are altered, e.g., by changing the wobble pattern or the track pitch, or by adding interruptions or eccentricity
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/0092—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which are linked to media defects or read/write errors
    • G11B20/00927—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which are linked to media defects or read/write errors wherein said defects or errors are generated on purpose, e.g. intended scratches
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • G11B7/00745—Sectoring or header formats within a track
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
    • G11B7/24085—Pits
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2211/00—Indexing scheme relating to details of data-processing equipment not covered by groups G06F3/00 - G06F13/00
    • G06F2211/007—Encryption, En-/decode, En-/decipher, En-/decypher, Scramble, (De-)compress
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G11B7/0037—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
    • G11B7/261—Preparing a master, e.g. exposing photoresist, electroforming

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Manufacturing Optical Record Carriers (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

An optical disc on which a number of spiral trains of regular pits and at least one train of irregular pits are formed. The regular pits of each of the trains is arranged symmetrically with respect to the center of a track. Further, each of the irregular pits has a predetermined shape different from a shape of each of the regular pits. Moreover, an arrangement of the train of the irregular pits being differently from an arrangement of each of the trains of the regular pits. Furthermore, a tracking error signal being obtained from the train of the irregular pits. Such an irregular pit can not be copied even when a normal optical disc containing such an irregular pit is copied by performing a conventional copying method. Thus, an illegal copy disc can be discriminated from a normal optical disc by checking whether or not an irregular pit is included in an optical disc. Consequently, a good copy protection can be achieved by easily detecting an illegal copy disc.

Description

CD, the device that detects CD reaches the device of recorded information on CD
The present invention relates to a kind of for example CD of CD-ROM (compact disc read-onlymemory) that is used for, it can prevent from the information (for example, video-game (being computer game)) of record on it is carried out unwarranted copy (being bootlegging).In addition, the present invention relates to a kind of pick-up unit that CD determines whether to contain on the CD information of illegal copies that is used to detect.In addition, the present invention relates to a kind of pen recorder that is used for recorded information on this CD.
In general, digital information signal and analogue information signal the two can be used for determining typical example as, one section music, an images, a character, the same information of data and so on.In addition, when information when digital information signal is copied (promptly being replicated), the delivery quality of the information that is copied or characteristic do not resemble and can decrease the situation of identical information of copy analogue information signal.Therefore; resemble in protection aspect the copyright of raw information of information of one section music of performance; with the copy of the raw information that digital information signal was showed (promptly make with performance for example, the Copy Info that the raw information of one section music is equally good) become a major issue.Promptly need the duplicating of digital information signal (or copy) forbidden or limited.
For example, can make CD-ROM or similar device as ISO 9660 standards of setting up by International Standards Organization with public standard.Defer to this standard, when the original digital information that prevents to copy on the CD, a Copy Protection password is recorded on the CD in advance.Therefore, a CD that comprises such password can be confirmed as normal disk.On the contrary, if CD does not comprise such password, just this CD can be confirmed as illegal copied disc.(for example, stop from so illegal copied disc on redisplaying information) then takes appropriate steps.And then, a large amount of CD-ROM that defer to this standard that make of expectation.
Yet,, when using a kind of copying equipment that can coil copy (promptly the data that write down on the CD being duplicated accurately), also can make a CD that can be confirmed as normal disk at an easy rate even utilize the method for this Copy Protection.This has just caused CD more weak phenomenon aspect the Copy Protection.As a result, the illegal copies CD is in vogue on market.
Therefore; the method of another Copy Protection has been proposed; utilize the method for this Copy Protection; a kind of standard that is different from aforementioned compact disk standards is established, and can not be read by the software that is used to read the CD of making according to generally held standard such as ISO 9660 according to the CD of this standard manufacture.But, even under the situation of the method for utilizing this Copy Protection, utilize copy device, the physical frame unit sense data from CD and with the copying data read in the CD of write-once type, any CD can be copied or duplicate.
In addition, be in the situation of the CD media that is called mini disk (MD) of CD development of 6.4CM utilize diameter by Sony, develop another kind and be called " copy management system continuously " copy protection system (SCMS).This SCMS technology be utilize a kind of protected code relevant with the permission of copies data prevent to be recorded on the CD data by digitally twice or repeatedly the copy.This protected code is to be represented by a part of digital signal that is recorded on the MD.That is, protected code is written to " the whole content " that MD goes up the data field of record in advance and (TOC) is distinguished.
In addition, (1) does not have protection if protected code is indicated, and data or information from then on MD (being source tray MD) copy target MD to.In addition, when from source MD when target MD copies, an indication has the protected code of Copy Protection to be written to the toc region of target MD.
On the contrary, (2) this means that this MD goes up the data that write down and has been copied once if a protected code indication that writes MD has the Copy Protection sign indicating number, can not copy once more.By this way, the digital signal that writes down on MD can prevent with twice in the form of numeral copy or repeatedly.
As mentioned above, in the situation of utilizing the SCMS technology, represent the information of protected code to be written to a CD.Then, copying equipment browing record on MD protected code and judge whether from then on copies data or information among the MD according to this protected code.
But (that is, the source CD) information signal is therefrom read and when copying another CD exactly to, be not only data, and protected code is also copied to the latter being recorded in CD.As a result, data can be from a source tray by unlimited another CD that copies to.Therefore, the behavior of the copies data of property infringement can not be prevented from.
Simultaneously, in CD equipment (as CD-audio player and CD-ROM drive in the market), there is an integrated circuit (IC) to detect tracking error.When tracking error was equal to or greater than predetermined value, this equipment was then judged and has been subjected to vibrations.In order to tackle this vibrations, the gain of the servo-drive system of this equipment increases.The concrete instance of this IC is the TC9236AF that Toshiba produces.Another IC detects the light quantity by CD reflection.When catoptrical light quantity change (promptly reduce or increase) reach be equal to or greater than a rate of oscillation to a certain degree the time, this equipment is judged on CD fault or defective.To guarantee phaselocked loop or noise elimination in order to overcome this defective.The AN8803SB that the real example of this IC is produced for mitsubishi electric Industrial Co., Ltd.
Therefore, can need not to design special circuit by the function of effectively utilizing this traditional IC and realize Copy Protection.The present invention considers afore-mentioned and makes.
One of purpose of the present invention provides a kind of CD, and thereon protection information of record can't utilize the method for the signal of traditional reproduction record to read, thereby, can prevent the illegal copies of data effectively.
Other purpose of the present invention is to provide a kind of pick-up unit to be used to detect such CD that can prevent the illegal copies of data effectively.
In addition, another object of the present invention provides a kind of being used in this data on it or the information of can preventing by the pen recorder of the CD identifying recording layer of illegal copies.
In order to reach aforementioned purpose, according to an aspect of the present invention, a kind of CD is provided, it comprises pit string and at least one irregular (or improper) pit string of the rule of a plurality of spirals, pit in (or normal) pit string of the rule of each is with respect to the center of session (below be sometimes referred to as the heart) symmetric offset spread, each irregular pit has the reservation shape different with each regular concave, the arrangement of irregular pit string is different with the arrangement of each regular concave string, never can obtain a tracking error signal in the regular concave string.
According to a second aspect of the invention, a kind of CD is provided, it comprises pit string and at least one irregular pit string of the rule of a plurality of spirals, the pit of the pit string of the rule of each is with respect to the center symmetric offset spread of session, each irregular pit has the reservation shape different with each regular concave, the arrangement of irregular pit string is different with the arrangement of each regular concave string, and the symmetry of the waveform of RF signal changes because of irregular pit string.
According to a third aspect of the invention we, a kind of CD is provided, it comprises pit string and at least one irregular pit string of the rule of a plurality of spirals, the pit of the pit string of the rule of each is with respect to the center symmetric offset spread of session, each irregular pit has the reservation shape different with each regular concave, the arrangement of irregular pit string is different with the arrangement of each regular concave string, and light amount signal changes because of irregular pit string.
According to a forth aspect of the invention, a kind of CD is provided, it comprises pit string and at least one irregular pit string of the rule of a plurality of spirals, the pit of the pit string of the rule of each is with respect to the center symmetric offset spread of session, each irregular pit has the reservation shape different with each regular concave, the arrangement of irregular pit string is different with the arrangement of each regular concave string, and irregular pit is arranged in and the represented corresponding presumptive area of data block of modulation signal with the form of regular concave string record discontinuously.
According to a fifth aspect of the invention, a kind of pick-up unit is provided, be used to detect the pit string of a rule that comprises a plurality of spirals and the CD of at least one irregular pit string, the pit of the pit string that each is regular is with respect to the center symmetric offset spread of session, each irregular pit has the reservation shape different with each regular concave, the arrangement of irregular pit string is different with the arrangement of each regular concave string, this device comprises a replay device, is used to reset be furnished with the zone of irregular pit string; A judgment means is used for whether having irregular pit string and judging that from testing result detected CD is the normal dish or the dish of bootlegging from result's detection of resetting.
According to a sixth aspect of the invention, a kind of pen recorder is provided, be used for CD identifying recording layer in pit string and at least one irregular pit string of a rule that comprises a plurality of spirals, the pit of the pit string that each is regular is with respect to the center symmetric offset spread of session, each irregular pit has the reservation shape different with each regular concave, the arrangement of irregular pit string is different with the arrangement of each regular concave string, and irregular pit is arranged in and the represented corresponding presumptive area of data block of modulation signal with the form of regular concave string record discontinuously.This device comprises: laser light-source device is used for producing and output laser; Chromacoder is used for converting digital signal to modulation signal; The Laser Modulation device is used for according to modulation signal the laser of exporting from LASER Light Source being carried out intensity modulated; The gate signal generation device is used to produce a gate signal synchronous with the data block of being represented by modulation signal; The laser modifier is used for synchronously changing laser with gate signal, makes it corresponding with irregular pit string; Laser radiation device is used for laser from laser modifier to the CD radiation that modulate respectively and change through Laser Modulation device and, forms pit string on CD.
Below, basic embodiment of the present invention is described.
(1) at first, in one embodiment of the present of invention (being CD), the irregular pit of each in the described string all is disposed on the center line of radially swing, and its amplitude of fluctuation is less than track pitch.
(2) secondly, in this embodiment of the present invention, hunting frequency is called any frequency height of tracking servo frequency band than those, in this frequency, the side beam that is used to follow the tracks of when a signal utilization is by light picker (the following pick-up that abbreviates as sometimes) playback time, the signal content that is included in the playback in the tracking error signal becomes minimum and opposite, and the swinging signal carrier wave becomes minimum.
(3) in addition, in an embodiment of the present invention, irregular pit string is arranged or is arranged on the part of the dish that the replay signal composition that is included in the tracking error signal diminishes.
(4) in addition, in an embodiment of the present invention, the dutycycle of each irregular pit (or factor) is unequal with the dutycycle of each regular concave.
(5) in addition, the radial width of the radial width of each irregular pit and each normal pits is unequal.
(6) in addition, the embodiment that is used to detect the pick-up unit of CD of the present invention comprises a decoding unit, is used for dividing reading information (or data block) and data block being decoded from the information recording part of CD; One first detecting unit is used to detect a servosignal (or data-signal) and is normally or undesired; One second detecting unit, whether mutually the output signal that is used to detect the output signal of decoding unit and first detecting unit in predetermined regular time point simple crosscorrelation; And judging unit, be used for judging whether to detect the irregular pit that is recorded in advance on the CD from the detection signal that second detecting unit is exported, thereby, for each detected CD, can determine one only the CD of regular pit the CD of the irregular pit that is recorded in CD is in advance still arranged.
(7) in addition, the embodiment of this pick-up unit comprises a tracking error signal detecting unit, is used to detect tracking error signal; Whether one the 3rd detecting unit, the signal level that is used to detect tracking error signal be near constant or resemble and change the pulse signal; A control module, be used for judging on the CD of reading whether have irregular pit to be detected, after judgement is made, start replay operations from tracking error signal, thereby whether each CD can exist on the basis of irregular pit identified.
(8) in addition, in the embodiment of the pick-up unit described in (7), described pick-up has adopted and a kind ofly has been called three beam method (promptly, three point-tracking methods), described the 3rd detecting unit comprises a bandwidth-limited circuit, a rectification circuit and a comparator circuit, and the centre frequency of described bandwidth-limited circuit is to set like this, in this frequency, the level of the pulse signal in the tracking error signal becomes maximum and the leakage of the data-signal that occurs in the tracking error signal becomes minimum.
(9) in addition, the pick-up unit of describing in (6) also comprises one the 3rd detecting unit, is used to detect the waveform of a RF signal with respect to the center of RF signal or the symmetry of reference level (that is layering level (back will be explained)); A layering level changes the unit, is used for changing according to detected symmetry the layering level of RF signal; A comparing unit, whether the change that is used for determining described layering level is within reference range; A judging unit is used for judging the CD of reading whether detect irregular pit from the output signal of this comparing unit, thereby whether each CD can have on the basis of irregular pit and obtain identification.
(10) in addition, in the pick-up unit described in (6), also have a light volume reflection signal generation unit, be used for dividing radiation laser and exporting a light volume reflection signal of representing the CD reflection amount to the information recording part of CD; A comparing unit, whether the change that is used for determining the light volume reflection is in reference range; An expanding element is used to expand the output signal of comparing unit; A judging unit is used for judging the CD of reading whether have irregular pit to be detected from the output signal of expanding element, thereby whether each CD can have on the basis of irregular pit and obtain identification.
(11) in addition, in another embodiment of the pick-up unit described in (6), also comprise one the 3rd detecting unit, be used for reading the data of each the predetermined address record of data block that on CD, writes down, and by determining whether to resemble the tracking error signal that changes the pulse signal and synchronously being detected according to the regular time point of determining in the data of reading address record, or whether synchronously detect with regular time point by the change of the layering level determining to obtain according to the RF signal waveform symmetry of layering level relatively, or by determining whether synchronously to detect with regular time point by the change of the light quantity of CD reflection, whether judgement has irregular pit to be detected on CD, thereby whether each CD can have and obtain identification on the basis of irregular pit.
(12) in addition, (6) another embodiment of the pick-up unit described in also comprises one the 3rd detecting unit, be used for reading the data of each predetermined address record of the data block that on CD, writes down, if the tracking error signal of judging more than pre-determined number that changes as pulse signal synchronously is detected with the regular time point of determining according to the data that write down at reading address, or the change and the regular time point of the layering level that obtains according to the symmetry of the RF signal waveform of relative layering level synchronously are detected, or synchronously be detected by the change and the regular time point of the light quantity of CD reflection, if and the tracking error signal of judging more than pre-determined number that changes as pulse signal with according to the regular time point of determining in the data of reading address record synchronously is not detected, or the change of the layering level that obtains according to the symmetry of the RF signal waveform of relative layering level synchronously is detected with regular time point, or synchronously be detected with regular time point by the change of the light quantity of CD reflection, then judging has irregular pit to be detected in dish.
(13) in addition, also comprise a storage unit at another embodiment of the pick-up unit described in (6), be used for the presumptive address of store storage in the data block of CD, this data block is used for determining optical disc types according to the judged result whether information pits of determining to form has irregular pit to be detected on dish, and one the 3rd detecting unit, be used for when packing CD into data block at the presumptive address record, and in data block, be detected by determining whether to resemble the tracking error signal that changes the pulse signal, or whether the change of the layering level by determining the RF signal is detected in data block, or whether the change of the level by determining light volume reflection signal is detected in data block, whether judge on dish has irregular pit to be detected, thereby whether each CD can have and obtain identification on the basis of irregular pit.
(14) in addition, another embodiment of pick-up unit described in (6) also comprises a storage unit, be used to store a predetermined address, in this address, the address table of data block is being stored on the CD, this data block is used for determining optical disc types according to the judged result that whether has irregular pit to be detected in the information pits that forms on CD, and one the 3rd detecting unit, be used for when packing CD into, reading described table at presumptive address, then, reading listed address institute data blocks stored in table, and in data block, be detected by determining whether to resemble the tracking error signal that changes the pulse signal, or whether the change of the layering level by determining the RF signal is detected in data block, or whether the change of the level by determining light volume reflection signal is detected in data block, whether have irregular pit be detected, thereby whether each CD can have and obtain identification on the basis of irregular pit if judging on dish.
(15) a kind of information record carrier comprises a lasing light emitter; Conversion equipment is used for converting digital signal to modulation signal, and modulating device is used for carrying out intensity modulated from the lasing light emitter emitted laser according to modulation signal, thereby, convert laser to recording laser; Object lens are used for forming pit string to CD radiation recording laser on CD; The gate signal generation device is used to produce and the synchronous gate signal of being represented by modulation signal of each data block; Irregular pit generation device is used to produce the irregular pit synchronous with described gate signal.
(16) in addition, another information record carrier comprises a lasing light emitter; Conversion equipment is used for converting digital signal to modulation signal; Modulating device is used for carrying out intensity modulated from the lasing light emitter emitted laser according to modulation signal, thereby, converting laser to recording laser, object lens are used for forming pit string to CD radiation recording laser on CD; The gate signal generation device is used to produce and the synchronous gate signal of being represented by modulation signal of each data block; The swinging signal generation device is used to produce the swinging signal synchronous with gate signal; Mobile device is used for forming laser spots according to swinging signal along disc radial direction moving recording laser on CD.
(17) in addition, another information record carrier comprises a lasing light emitter; Conversion equipment is used for converting digital signal to modulation signal modulating device; Be used for carrying out intensity modulated according to modulation signal from the lasing light emitter emitted laser, thereby, convert laser to recording laser; Object lens are used for to CD radiation recording laser and form pit string on CDs; The gate signal generation device is used to produce and the synchronous gate signal of being represented by modulation signal of each data block; A duty factor modifier is used for the duty factor according to gate signal change modulation signal.
(18) in addition, another information record carrier comprises a lasing light emitter; Conversion equipment is used for converting digital signal to modulation signal; Modulating device is used for carrying out intensity modulated from the lasing light emitter emitted laser according to modulation signal, thereby, convert laser to recording laser; Object lens are used for to CD radiation recording laser and form pit string on CDs; The gate signal generation device is used to produce and the synchronous gate signal of being represented by modulation signal of each data block, and the width modifier, is used for changing according to gate signal the radial width of pit string.
Therefore, in CD of the present invention, between rule or normal pit, be formed with an irregular pit at least.In addition, from this irregular pit, can obtain tracking error signal.In addition, light amount signal changes because of irregular pit.This can be used for detecting irregular pit.Both made and utilized traditional copy method that the normal CD that contains this irregular pit is copied, this irregular pit can not be copied.Therefore, by detect whether irregular pit is arranged on CD, can from normal CD, identify the dish of illegal copies.Like this, by detecting the illegal copies dish at an easy rate, can obtain a kind of method of good Copy Protection.
Other feature of the present invention, purpose and advantage are by can be more distinct to the detailed description of most preferred embodiment with reference to accompanying drawing, and wherein, in different accompanying drawings, same label is represented same parts.
Fig. 1 (A) has shown the shape of the pit that utilizes first CD of the present invention (being first example of the first embodiment of the present invention);
Fig. 1 (B) is an oscillogram, has shown the waveform of tracking error signal of first example of the first embodiment of the present invention;
Fig. 2 (A) has shown the shape of the pit that utilizes second CD of the present invention (being second example of the first embodiment of the present invention);
Fig. 2 (B) is an oscillogram, has shown the waveform of tracking error signal of second example of the first embodiment of the present invention;
Fig. 3 is for showing the schematic block diagram of the structure of utilizing pick-up unit of the present invention;
Fig. 4 is the process flow diagram of operation of the pick-up unit of displayed map 3;
Fig. 5 (A), 5 (B) and 5 (C) are the synoptic diagram of the pit shape of the demonstration second embodiment of the present invention;
Fig. 5 (D) has shown the light amount signal of the second embodiment of the present invention;
Fig. 5 (E) is an oscillogram, has shown the waveform by the signal that will obtain from the light amount signal addition that two photodetectors of the fifth embodiment of the present invention are exported;
Fig. 5 (F) is an oscillogram, has shown the waveform of the reflection light quantity change of the fifth embodiment of the present invention;
Fig. 6 (A) has shown the shape of the 3rd embodiment pit of the present invention;
Fig. 6 (B) is an oscillogram, has shown the waveform of the tracking error signal of the third embodiment of the present invention;
Fig. 7 (A) has shown the relation between the irregular pit string of frame of the third embodiment of the present invention to 7 (E);
Fig. 8 is the curve of the relation between swinging signal and the noise in the demonstration third embodiment of the present invention;
Fig. 9 is for showing the schematic block diagram that is used for the structure of the replay device of replay data from CD (that is the 3rd embodiment) of the present invention;
Figure 10 is the schematic block diagram of the structure of an example of the tracking error signal testing circuit of a pulse of demonstration;
Figure 11 (A) is an oscillogram to 11 (E), and each waveform has shown the operation of the tracking error signal testing circuit of pulse;
Figure 12 (A) has shown to 12 (E) and has utilized the timing of a microcomputer to the identification of swinging signal in the third embodiment of the present invention.
Figure 13 is for showing the process flow diagram that is used for the operation of the replay device of replay data from CD (that is the 3rd embodiment) of the present invention;
Figure 14 is for showing the schematic block diagram that is used for the structure of the pen recorder of record data in CD (that is the 3rd embodiment) of the present invention;
Figure 15 (A) has shown the irregular pit string of the fourth embodiment of the present invention to 15 (C);
Figure 16 has shown the change that is called " layering level " of radio frequency (RF) signal in the fourth embodiment of the present invention;
Figure 17 (A) each in 17 (B) has shown other shape of the irregular pit in the fourth embodiment of the present invention;
Figure 18 is for showing the schematic block diagram that is used for the structure of the replay device of replay data from CD (that is the 4th embodiment) of the present invention;
Figure 19 changes the schematic block diagram of structure of an example of testing circuit for the symmetry of change of symmetry of waveform that is used for detecting the RF signal of the fourth embodiment of the present invention;
Figure 20 (A) is an oscillogram to 20 (C), and each has shown that symmetry of the present invention changes the process flow diagram of the operation of testing circuit;
Figure 21 is for showing the schematic block diagram that is used for the structure of the pen recorder of record data in CD (that is the 4th embodiment) of the present invention;
Each has shown the operation of the writing circuit among Figure 21 to Figure 22 (A) to 22 (F);
Figure 23 (A) has shown another example of the irregular pit string of the fifth embodiment of the present invention to 23 (B);
Figure 24 is for showing the schematic block diagram that is used for the structure of the replay device of replay data from CD (that is the 5th embodiment) of the present invention;
Figure 25 is the schematic block diagram of the structure of an example of demonstration light quantity change testing circuit;
Figure 26 is for showing the schematic block diagram that is used for the structure of the pen recorder of record data in CD (that is the 5th embodiment) of the present invention;
Figure 27 (A) is to the synoptic diagram of 27 (F) for the operation of the pen recorder among demonstration Figure 26.
With reference to the accompanying drawings embodiments of the invention (that is, CD of the present invention, pick-up unit and pen recorder) are described.
(embodiment 1)
1 (A) and 1 (B) are described in detail the first embodiment of the present invention to Fig. 4 with reference to the accompanying drawings.In the first embodiment of the present invention, normal CD can be distinguished from the illegal copies dish by the tracking error that increases normal CD wittingly.
1) CD
Fig. 1 (A) has shown the example of shape of each pit of the first embodiment of the present invention (that is CD).Fig. 1 (B) has shown the waveform of the tracking error signal that obtains when reading the information of being represented by the pit on the CD.In Fig. 1 (A), the pit PA in left side district by arrow FA indication forms according to generally held standard.In addition, as shown in the drawing, the shape of each pit PA is symmetrical with the center line of road TR (that is the road heart).And the upper width of each pit PA-at the width on the top of the center line of road TR equates with the width of the center line bottom of road TR.On the contrary, in the situation by the pit PB in the right side district of arrow FB indication, the width of the bottom of each pit PB (in this example, the bottom below the center line of road TR) is bigger than the width of other parts, as shown in the drawing.
On the other hand, as everyone knows, tracking error signal is employedly in the three beams method (that is three point-tracking methods) to be called laser beam spot (promptly by being called to the pit string radiation, trace point) S1 will obtain from subtracting each other between the light quantity of eccentric point S1 and S3 reflection to S3.Under the situation of the pit string of Fig. 1 (A), the shape of pit PA each rule that forms in the zone shown in the arrow FA or normal is that relative road TR is symmetrical as mentioned above.Therefore, equal substantially by a light quantity of S3 reflection by a light quantity of S1 reflection.As a result, the level of the tracking error signal that the zone shown in the arrow FA obtains equals " 0 " substantially, shown in Fig. 1 (B).
But in the indicated zone of arrow FB, the shape of each pit PB is not with road TR symmetry.Therefore, become by the light quantity of some S1 reflection and be not equal to by a light quantity of S3 reflection.As a result, tracking error has increased, and becomes shown in Fig. 1 (B) from the waveform of the tracking error signal that obtains in the zone shown in the arrow FB.
Refer now to Fig. 2 (A), shown second example of shape of each pit of CD of the present invention (that is first embodiment) here.In addition, Fig. 2 (B) has shown the waveform of the tracking error signal that obtains when reading the information of being represented by the pit on the CD.Shown in Fig. 2 (A), the pit PA shown in the indicated left side district of arrow FA forms according to common mode, and is similar to the situation of first example.On the contrary, the pit PC in the right side district that arrow FC is indicated arranges that in the mode of relative road TR swing its shape is similar to the shape of the pit PA in left side district.
When this pit string by with first example in the radiation of situation similar laser bundle the time, the tracking error signal that obtains from the indicated zone of arrow FA is " 0 " no better than, shown in Fig. 2 (B).But in the zone shown in the arrow FC, pit PC has departed from road TR shown in Fig. 2 (C).As a result, become by the light quantity of some S1 reflection and be not equal to by a light quantity of S3 reflection.Therefore, tracking error has increased, the result, and the waveform of the tracking error signal that obtains from the indicated zone of arrow FC becomes shown in Fig. 2 (B).
In the middle of first embodiment, except pit group PA (that is, the regular concave group) in addition, this CD also comprises a string or one group of pit PB and PC (that is, irregular pit group) at least, their shape and arranging as mentioned above.Aspect data layout, this irregular pit (that is, causing the pit of tracking error) is formed at the position that does not influence the data (that is the raw data of being represented by normal or regular pit) that are recorded in dish in advance.In addition, the length of the pit of each improper (or irregular) is arranged to make the tracking error signal that causes because of irregular pit not influence replay operations.
In addition, a plurality of positions that are preferably on the CD form irregular pit.This is because when have only an irregular dimple-shaped to be formed in certain position of CD, if when an illegal copies dish has a stain or cut, then this illegal copies dish might quilt as normal disk.Obviously, the irregular pit that forms on dish is many more, and the chance of makeing mistakes is few more.
Even need not three point-tracking methods and use Dan Shu to recommend tracking, also can obtain similar result.
2) pick-up unit
Below with reference to Fig. 3 pick-up unit of the present invention is described.The figure illustrates the pick-up unit major part relevant with first embodiment.As shown in the drawing, aforesaid irregular pit DP is formed on address AD 1 in the CD 10 for example to AD3.In addition, be used for having the CD detecting unit 12 of packing into from the replay device of CD 10 playback informations, whether its detects has CD to be loaded into.In addition, CD 10 is driven under the control of dish drive part 14.In addition, being used to export aforesaid three laser beam and detecting from the pick-up 16 of the light of three point reflections is driven under the control of pick-up drive part 18.
In addition, the bundle of pick-up 16 detects output and is sent to an amplifying circuit 20, an amplifying circuit 20 output light amount signal and tracking error signals.These signals are sent to signal processing circuit 22.In addition, a microcomputer 24 is received signal processing circuit 22 and is provided a tracking error signal from circuit 22.In addition, the representative data of address AD 1 to AD3 that are formed with irregular pit are stored in the interior storer 26 of microcomputer 24.In addition, microcomputer 24 also is connected to display unit 18 except receiving dish drive part 14 and pick-up drive part 18.
The operation of the pick-up unit of first embodiment is described below with reference to Fig. 4.At first, the CD 10 of packing into, the CD 10 that is loaded into is detected by pack into testing circuit 12 of CD.At this moment, at step SA, the information notice microcomputer 24 that CD 10 is packed into and finished.24 pairs of these push-notification-answer of microcomputer are read the data that are stored in advance in the storer 26 then, and these data representation address AD 1 to AD3 in these addresses, are formed with irregular pit.Next, microcomputer 24 is delivered to dish drive part 14 and pick-up drive part 8 respectively with driving command.So, read in the irregular pit string that address AD 1 forms.That is, dish 10 and pick-up 16 are driven by part 14 and 16 respectively, and the irregular pit that forms in address AD 1 is shone by three laser beam spots.
Then, receive by the picked device 16 of the light of each laser beam spot reflection.Next, the reflected light of reception further converts electric signal to by pick-up 16.Then, this electric signal is sent to (that is, input) amplifying circuit 20, thereby, from input signal, obtain tracking error signal and light amount signal.Then, tracking error signal is delivered to microcomputer 24 from signal processing circuit 22.
As mentioned above, the irregular pit DP in Fig. 3, the level of tracking error signal increases.So at step SB, this phenomenon is used to detect irregular pit DP.Continuation is to carrying out the operation of the irregular pit DP of this detection at the pit of address AD 2 and AD3 formation.In addition, when at step SC, irregular pit DP is by continuously when address AD 1 to AD3 detects, and microcomputer 24 judges that CDs 10 are a normal disk.Then, at step SD, carry out common replay operations.
The operation of replay data of the copied disc of a normal disk 10 is described below.After the copied disc of a normal disk (that is, source tray) 10 was made, the signal that is recorded on the normal disk 10 at first was utilized as a CD-ROM playback.Then, the replay signal that obtains by the signal of playback of recorded on dish 10 is recorded in object optical disc as a CD-WO or similar dish.In this case, by to carrying out error correction with the corresponding part of irregular pit, data are copied into object optical disc.Therefore, object optical disc does not comprise irregular pit.Exteriorly, object optical disc is a copied disc that all information that are recorded in normal source tray all are copied well.But in fact, object optical disc does not comprise irregular pit.
When this object optical disc was placed to the replay device of Fig. 3, address AD 1 to AD3 was accessed equally.Then, the operation of detection tracking error signal is performed.But, as mentioned above, because object optical disc does not contain irregular pit, so, there is not tracking error signal from object optical disc, to be detected.As a result, at step SE, microcomputer 24 judges that this dish is not normal copied disc (that is, not being the legal copies dish).Then, microcomputer 24 direction display unit 28 show this true information of indication.In addition, microcomputer 24 indicator signal treatment circuits 22 stop output signal.
Like this, when object optical disc is illegal copies dish when (that is, not containing irregular pit), reset) operation ended.As a result, the illegal copies data are prevented from CD.Even utilize a kind of copy device that is used for copies data that copies to destination disk from source tray with the physical frame unit, copy function is to insert some suitable data by the district that takes place to tracking error.Therefore, when data playback time from the copied disc of utilizing this copy device and obtaining, do not have tracking error from the corresponding district of irregular pit of source tray obtain.Therefore, replay data is prevented from this illegal copies dish.
When being used for not having aforesaid pick-up unit from the replay device of CD replay data, maybe under the data or situation that information is made mistakes of the address of the irregular pit of expression, when attempting to read CD, the location of mistakes or error in data can occur because of irregular pit, so device stops.That is, under first embodiment of the present invention situation, replay device should have the location of mistakes or the error in data of intended function to prevent to occur because of irregular pit.With this viewpoint, Copy Protection can be strengthened.
(embodiment 2)
The second embodiment of the present invention is described to 5 (D) below with reference to Fig. 5 (A).In these figure, identical label represent with first embodiment in identical parts.In the second embodiment of the present invention, normal CD can be distinguished from the illegal copies dish by the reflection light quantity that increases normal CD wittingly.
Fig. 5 (A) has shown the shape of the pit of CD of the present invention (that is second embodiment) to 5 (C).In these figure, the pit PA in the Zuo Qu He You district of arrow FA indication forms with generally held standard.On the contrary, the district (district that for example, comprises pit PD) by arrow FD indication is the characteristic area of second embodiment of the invention.In the example of Fig. 5 (A), the length of each pit PD is set to and is shorter than the minor increment 3T (T represents a data bit time) that is utilized in eight to 14 modulation (EFM).In another example shown in Fig. 5 (B), be a minute surface mark P E and do not form pit PD by the district of arrow FD indication.In the example of Figure 50 (C), pit PF shoals by utilizing an exposure system (not shown) to change exposure (i.e. exposure).Below, for convenience, the minute surface sign is called as irregular or improper pit sometimes.
In a second embodiment, similar with the situation of first embodiment, the light amount signal shown in Fig. 5 (D) draws by utilizing laser beam spot S1 to obtain reflection light quantity to S3 to the pit string irradiation.This light amount signal is that conduct is from being used for receiving from central point S2 total photoelectric conversion signal of catoptrical four sections optical pickup apparatus (not shown) output, or obtain from total photoelectric conversion signal of optical pickup apparatus output, this optical pickup apparatus is respectively from a S1, and S2 and S3 receive reflected light.
In a second embodiment, CD comprises a string or one group of irregular pit PD at least, PE and PF, and their shape and arrangement are as mentioned above.On data layout, this irregular pit is formed on this irregular pit not to be influenced on the position of the data that are recorded in dish in advance, similar with the situation of first embodiment.The length of each improper (or irregular) pit is to set like this, and promptly the tracking error signal that produces because of irregular pit should not influence regenerative operation.In addition, these irregular pits are to be formed at a plurality of positions on the CD with the similar mode of first embodiment.
The structural similarity of the CD pick-up unit of second embodiment and the pick-up unit of first embodiment is the tracking error signal that replaces first embodiment with light amount signal.
Signal shown in Fig. 5 (E) and Fig. 5 (F) will be described later.
The example of the pick-up unit that utilizes the IC that is used for the process disk signal common on the market is described below.For example, in the situation of " TC9236AF " that produced by Toshiba, tracking error is detected continuously.When the absolute value of predetermined threshold value and the difference between the tracking error exceeded a predetermined value, this true detection signal of indication was output.Aforementioned detecting operation can be obtained by the microcomputer 24 that this detection signal is input to Fig. 3.Using under the situation of identical IC, when the absolute value of the difference between the level of the level of light amount signal and rate of oscillation hierarchical signal exceeds a predetermined value, indicating this true detection signal to be output for one.Aforementioned detecting operation can be obtained by the microcomputer 24 that this detection signal is input to Fig. 3.
In addition, in the situation of the head amplifier IC " AN8803SB " that is produced by Mitsubishi, when tracking error exceeded preset range, this true signal of indication was output.When reflection light quantity increases and the level of RF signal when reducing relatively, another indicates this true signal to be output.Therefore, aforesaid detecting operation can be achieved by utilizing this detection signal.
(embodiment 3)
The third embodiment of the present invention is described in detail to Figure 14 below with reference to Fig. 6 (A) and 6 (B).
1) CD
At first, the shape of the pit that forms among the 3rd embodiment is described to Figure 14 with reference to Fig. 6 (A) and 6 (B).
Fig. 6 (A) has shown the shape of being called in the third embodiment of the invention " wobble pits ".Fig. 6 (B) has shown the waveform of the tracking error signal that obtains when reading the wobble pits of Fig. 6 (A).Shown in Fig. 6 (A), the shape of the pit in left side district is similar to the general pits of CD with arrangement.That is, the center line of the pit string in left side district is consistent with the center line in road.On the contrary, the center line of the irregular pit string in right district and the actual center line in road are inconsistent, and this center line is represented by dotted lines in the drawings.Therefore, the center line in the misalignment road of irregular pit presents " swing ".
When the pit string illumination beam point S1 in left side district is followed the tracks of when obtaining tracking error signal to S3, the light quantity of some S1 and S3 reflection is equal substantially.As a result, tracking error signal equals " 0 ".On the contrary, when to the irregular pit string illumination beam point S1 in right side district when S3 follows the tracks of, the light quantity of some S1 and S3 reflection is unequal, the level of tracking error signal and (below be sometimes referred to as bias) increase pro rata from the actual center line in road to the distance each pit in right side district.Therefore, when the part that comprises wobble pits or regional, promptly obtain a swinging signal that is superimposed on the tracking error signal by playback time.
In this embodiment, this swinging signal is recorded on the predetermined road in the data block unit periodically and discontinuously.Therefore, if a swinging signal by (that is, the signal that is recorded) data block synchronously obtains, and this dish can be confirmed as normal CD with tracer signal discontinuously.On the contrary, this dish then is confirmed as the illegal copies dish.As a result, illegal copies can be prevented from.
To bias being restricted to the location of mistakes that an excessive increase in the tracking error that is enough to prevent to cause because of wobble pits occurs, and read the mistake of the data of representing by pit and the predetermined value of the error in data (that is reading mistake) that occurs is necessary.In this embodiment, this bias (that is, the width between the actual center line in irregular pit and road) is set and is equal to or less than about 2% of track pitch, and is set about 5% of the radial width that is equal to or less than pit.
Fig. 7 A (A) has shown the example of the layout of the irregular pit of swinging to 7 (D).As shown in these figures, each irregular pit string is arranged in some frame units (referring to Fig. 7 (E)) by the form (referring to Fig. 7 (D)) with pulse discontinuously.In this embodiment, irregular pit string is disposed in the even frame, and rule (or normal) pit string is disposed in each odd-numbered frame.Fig. 7 (E) has shown the swinging signal that expression is caused by irregular pit and the waveform of the tracking error signal of the tracking error that produces.
The frequency of the swinging signal that causes because of irregular pit is described below with reference to Fig. 8.When utilizing the three beams point on normal optical disk, during replay data, to include a record signal content in the frequency spectrum of the tracking error signal that obtains by curve GA indication by pick-up.The level of tracer signal composition increases or reduces in the section by the side beam point S1 of Fig. 1 (A) and the distance decision between the S2.This tracer signal composition with its level (that is, corresponding to some A and C among Fig. 8) in the frequency place of peak value correspondence become noise.Therefore, under the situation of swinging signal, the composition-noise ratio that can not obtain (C/N) (referring to GB and GC).
But this noise reduces (that is, corresponding to a B) at the corresponding frequency of the low ebb place with the level of tracer signal composition.Therefore, at good C/N of a B with obtained (referring to GB).Therefore, selection is highly effective (for example, some B) with the corresponding frequency of low ebb of the level of tracer signal composition to obtain a good C/N.
In addition, the part that on CD, forms (for example, reading in and read the district) with data " 0 ", the tracer signal composition reduces, as shown in the dotted line GE of Fig. 8.Therefore, consider described swinging signal, can obtain a good C/N, so the part with data " 0 " (for example, reading in and read the district), it is very useful forming the irregular pit string that produces swinging signal.
2) replay device
With reference to Fig. 9 to 13 replay device that is used for the data of playback of recorded on CD according to the 3rd embodiment is described below.Fig. 9 shows that (that is the schematic block diagram of the structure of the replay device of) replay data, the 3rd embodiment, this CD comprises foregoing irregular pit from CD of the present invention.At first, a signal of being read from CD 30 by pick-up 32 is sent to a RF treatment circuit 34 and a servo processing circuit 36.Afterwards, be sent to a signal processing circuit 38 from RF signal of RF treatment circuit 34 outputs.And then, the subcode and the frame information that are obtained by this circuit are sent to microcomputer 40.
In addition, in a common CD-ROM replay device, servo processing circuit 36 is equipped with a tracking error signal test section, utilizes this part, in tracking depart from or error is detected and is used as a tracking error signal.This tracking error signal is sent to a pulse tracking error-detector circuit 42.Subsequently, signal is extracted out in arteries and veins.Afterwards, signal is imported microcomputer 40 as a data-signal in this arteries and veins.
Figure 10 shows the example of a pulse tracking error-detector circuit 42.As shown in the figure, this pulse tracking error-detector circuit 42 has comprised a bandpass filter that only is used to extract pulse signal frequency, a rectification circuit 42B who is used for burst signal is changed into a direct current (dc) signal, a benchmark output system 42C and a comparer 42D.In addition, the dotted line GF of Fig. 8 demonstrates the feature that bandpass filter 42A is had.As shown in Figure 8, centre frequency is set to the frequency corresponding to a B, so that only extract a swinging signal effectively.In the middle of reality, can use the trapezoidal characteristic GF of the characteristic of unimodal umbilicate type with alternate figures 8.
Introduce the operation of pulse tracking error-detector circuit 42 below to 11 (B) with reference to Figure 11 (A).The pulse that is caused by the irregular pit string of each even frame of Figure 11 (A) and the tracking error signal that produces are from servo processing circuit 36 outputs of Fig. 9 and deliver to the pulse tracking error-detector circuit 42 shown in Figure 11 (B).Afterwards, have only a predetermined frequency content to be extracted in the error originated from input signal from bandpass filter 42A.So shown in Figure 11 (C), noise contribution is eliminated.
Next, this signal that obtains is by rectification circuit 42B rectification.Thereby envelope is extracted out and further is input to the inverting input of comparer 42D shown in Figure 11 (D).On the other hand, a reference signal Vth (referring to Figure 11 (D)) is sent to the non-inverting input of comparer 42D from benchmark output circuit 42C.
Then, comparer 42D relatively imports the signal of its inverting input and the signal of its non-inverting input of input, and converts described envelope to digital signal.When reading a frame from CD 30, microcomputer 40 is with reference to (that is, reading) this pulse tracking error signal.When the digital signal from comparer 42D output is designated as logic high (H), microcomputer 40 defines pulse, shown in Figure 11 (E), when the digital signal from comparer 42D output was designated as logic high (L), microcomputer 40 determined there is not pulse.
Figure 12 has shown that swinging signal is not recorded in each odd-numbered frame of dish 30, but is recorded in each even frame by the timing of a swinging signal of microcomputer 40 identifications.That is, the swinging signal of record occurs at the interval frame, and therefore, the swinging signal on dish is to be interrupted to arrange.Figure 12 (A) has shown frame number; Figure 12 (B) has shown tracking error signal; Figure 12 (C) has shown the pulse tracking error signal of Figure 11 (E).
When microcomputer 40 when the signal processing circuit 38 of Fig. 9 receives the frame number of Figure 12 (D), this frame number is received that in the QA section of Figure 12 (E) back is discerned in the QB section.Then, after predetermined time-delay, the pulse tracking error signal is read out at the section QC of this figure.Under the situation of even frame, when being recorded on it, counts swinging signal.On the contrary, under the situation of odd-numbered frame, when having swinging signal to write down on it, do not count.Other is handled in other section of Figure 12 (E) rather than at section QA, and QB and QC carry out.
Be described in detail in the operation of from normal CD, distinguishing out the illegal copies dish under the situation of this embodiment below by reference Figure 13.At first, after the power supply (not shown) is connected, put well at step S1 affirmation dish 30.Then, at S2, toc region is read.Fruit judges that at step S3 placing is a data memory disc (DA), as CD, carries out common audio playback operation at step S4.On the contrary, if judge that at step S3 this dish is a CD-ROM, seeks the operation of the session that is formed with irregular pit string at step S5.After step S6 counting is cleared, read a frame and pulse tracking error signal respectively at step S7 and S8.
If in an even frame pulse is arranged, microcomputer 40 increases by 1 with the counting of even frame (below be sometimes referred to as the even frame counting).If no, microcomputer 40 does not increase even frame counting (referring to step S9, S10 and S11).Similarly, if in an odd-numbered frame pulse is arranged, the counting (below be sometimes referred to as odd-numbered frame counting) that microcomputer 40 will be counted frame increases by 1, if do not have, microcomputer 40 does not increase odd-numbered frame counting (referring to step S9, S12 and S13).Aforementioned operation is repeated to carry out, and is read out (referring to step S14) up to predetermined frame.
As a result, if even frame counting and odd-numbered frame counting are equal to or greater than a predetermined number (the Y branch that sends referring to step S15 and step S16), be that this CD 30 is a normal disk in step S17 judgement.So, begin a common ROM replay operations (for example, program that is used for computer game of playback).On the contrary, if having one in even frame and the odd-numbered frame counting at least less than predetermined number (the N branch that sends referring to step S15 and S16), judging CD 30 at step S17 is an improper dish.Then, respectively at step S19 and S20, dish 30 stops the rotation and is discharged from.
In the middle of the reality, this algorithm is applicable to have only a string and the corresponding wobble pits in address (that is, irregular pit) that sought to be comprised in situation in the dish 30 (that is, have only a memory block coiling in 30, wherein be formed with the wobble pits string) in step S5.But, when many memory blocks of CD 30 all are formed with the wobble pits string, can be reduced because of the defective on the dish or stain are judged as normal possibility with illegal copies dish mistake.Therefore, CD can be detected more accurately.
In the example of Figure 13, the address of wobble pits is stored in the replay device in advance.CD can be made to has the memory block that a plurality of wobble pits and are used to store the table of described a plurality of wobble pits address.And replay device is only stored the address of the described table of each disc recording.In this case, replay device is at first searched (that is, visit) and the corresponding road, address that described table is recorded, and reads this table then.Next, replay device is visited a plurality of Swing Road wobble detection pits.Utilize this technology, before table was decrypted, copy sign indicating number detecting operation was difficult to be known by the people.That is, dish and replay device are analyzed and the illegal copies of realization dish are very difficult.
So, according to the replay device of present embodiment, utilize common CD-ROM drive to read to contain the CD of irregular pit so that when copying this dish, except irregular pit, data can correctly be copied on a destination disk such as the CD-WO.Obviously in copy procedure, there be not wrong the generation.In addition, utilize this destination disk, can make a large amount of copied disc as stamper.
But, although data have correctly been copied to destination disk, above irregular pit does not copy to.As a result, when the replay device that utilizes present embodiment is attempted from this destination disk (that is, the illegal copies dish) replay data, do not have tracking error signal to be detected in predetermined address, so replay operations can not be carried out.Like this, the illegal copies dish can be got rid of effectively.This point is equally applicable to the embodiment of back.In fact, as previously mentioned, when the replay device that is used for from the CD replay data is not equipped with aforesaid pick-up unit, or when representing to make mistakes in the data of irregular pit or address, if attempt to read this CD, search mistake or error in data can occur because of irregular pit for one, so device is stopped.In addition, this replay device should have search mistake or the error in data of intended function to prevent to occur because of irregular pit.Like this, Copy Protection can be reinforced.
3) pen recorder
Describe the pen recorder (that is stamper machine) of the CD be used to obtain this embodiment in detail below with reference to Figure 14.As shown in the drawing, be used for protection, for example, the numerical data of Games Software is imported into an EFM scrambler 50, and this scrambler becomes the EFM signal to export the EFM signal then this data-switching.On the one hand, the EFM signal is imported into a photomodulator driver 52.Then, a photomodulator drive signal is imported into photomodulator 54 from driver 52.
In addition, the EFM signal is imported into a subcode reader 56, subcode reader 56 with subcode signal from the EFM signal from extracting and with the subcode signal output of extracting.This subcode signal is imported into a CPU (central processing unit) (CPU) 58 and gate signal generator 60.CPU58 monitors the address information of being represented by subcode signal continuously, when subcode signal begins to represent the presumptive address of record protection sign indicating number, exports this control signal of a control signal (referring to Fig. 7 (B)) and is imported into gate signal generator 60.
When CPU58 receives control signal, gate signal generator 60 produces gate signals synchronous with sub-code frame (referring to Fig. 7 (C)).This gate signal is corresponding to a protected code.At sub-code frame be, for example under the situation of odd-numbered frame, gate signal has a low-signal levels, corresponding to logical value L (that is low level).When sub-code frame is, for example under the situation of even frame, gate signal has a high signal level, corresponding to logical value H (that is high level).Obviously, sub-code frame is under the situation of odd-numbered frame, and gate signal also can have the high level corresponding to logical value H, and sub-code frame is under the situation of even frame, and gate signal also can have the low level corresponding to logical value L.This gate signal is imported into frequency generator (FG) 62.
When gate signal has high level " H " (that is, under the situation of even frame), FG62 produces the sine wave with preset frequency.But when gate signal has low level " L " (that is, under the situation of odd-numbered frame), FG62 does not have waveform output.So, become the impulse hunting signal synchronous (referring to Fig. 7 (D)) with sub-code frame from the signal of FG62 output.This swinging signal is transfused to light deflection driver 64, and the light deflection driven signal of exporting from driver 64 is imported into photodetector 66.
On the other hand, laser La shines photomodulator 54 continuously from laser oscillator 68.Therefore, laser La at first passes through on the photomodulator 54.When laser process photomodulator, laser La is subjected to the signal modulation of photomodulator drive signal, converts laser Lb to, and its intensity changes in time.Laser Lb is subjected to the deflection of light deflection driven signal through light deflector 66, so laser Lb becomes laser Lc. laser Lc and shines a stamper 72 from this through object lens 70 and become a little point.Owing to utilize a light deflector 66, this little footpath at stamper 72 upwards is deflected.As a result, the wobble pits figure shown in Fig. 6 (A) is formed.Like this, the stamper that is suitable for the irregular pit string that comprises swing of Copy Protection can obtain.
As mentioned above; according to present embodiment be used for make at least one irregular pit string of master record at the pen recorder of video disc recording data; its shape is different with normal pits with arrangement; and arrange accordingly with the data block of tracer signal, rather than in the data that will be recorded on the CD record protection sign indicating number.Therefore, the producer beyond the stamper wright needs a large amount of investments in the manufacturing process of stamper.Therefore be difficult to duplicate.Therefore Copy Protection is achieved (this point is suitable equally in the embodiment of back).
At the open NO of Japanese unexamined patent publication No..A kind of recording medium with the swing part that writes the address has been described among the H2-87344, and at the replay device of pen recorder that is used for record data on this recording medium and the data that on this recording medium, write down of being used to reset.But when using this medium, data will be read bit by bit, shown in the Fig. 3 and 4 in this careful patent disclosure.Therefore this device should be equipped with the circuit that is called the cycleoperation circuit.In addition, in this device, data decoding is regularly very strict.The circuit structure of this device of result is very complicated, and data recording density is also very high.As a result, the reading error rate is very high.
On the contrary, under the situation of embodiments of the invention, the circuit structure of device can be simple relatively.The manufacturing cost of replay device is also very little.Aspect data layout, corresponding to long relatively time of part continuity of the segment pulse of signal.Therefore data recording density is less relatively.Data can not have the ground of obstruction record, and irrelevant with the number of the defective of coiling.In the present embodiment, the fault of construction of many dishes can allow relatively.The turnout of dish also can increase.The production cost of dish can be lowered.Dish in use will adhere to dust usually or is scratched, because the data recording density corresponding to the dish of the segment pulse of signal of dish of the present invention is lower, so have the ability of anti-dust and scuffing.
(embodiment 4)
1) CD
Below with reference to Figure 15 (A), 15 (B) and 15 (C) describe the fourth embodiment of the present invention (that is CD) in detail to 21.This embodiment has utilized the symmetry of the RF signal of exporting from pick-up.
Following with reference to Figure 15 (A), 15 (B) and 15 (C) are described in detail in the shape that dish is gone up the pit that forms to Figure 17.Figure 15 (B) has shown that having dutycycle is 50% pit string.Figure 16 has shown the waveform of the RF signal that the data of the pit playback from Figure 15 (A) to 15 (C) obtain.As can be seen, these RF signals are its center line relatively from these figure, and promptly the center line of the rhombus part (that is, being called " eye ") of beating shade among this figure is symmetrical, and this center line is corresponding to being called the layering level.
The tracer signal that shown Figure 15 (A) stands duty factor and proofreaies and correct the pit string that forms afterwards.Compare with the pit string of Figure 15 (B), the length of the horizontal direction of each pit of Figure 15 (A) (promptly tangential) is than each short length 2a of length of horizontal direction of Figure 15 (B).When from the such pit replay data of Figure 15 (A), the RF signal is with respect to the symmetry disappearance of its center line, and in Figure 16, the layering level moves up.Similar with the situation of Fig. 5 (A), Figure 15 (C) has shown that tracer signal stands after the duty factor correction pit string of formation.Compare with the pit string of Figure 15 (B), the length on the horizontal direction of the pit string of Figure 15 (C) is than the long length 2b of the length on the horizontal direction of each pit of Figure 15 (B).When data from the such pit playback time of Figure 15 (C), the layering level among Figure 16 moves down, promptly the layering level in Figure 16 moves up or down according to the change of the duty factor of pit, so, form a broken line.
Figure 17 (A) has shown another example of the pit string that causes that RF signal layering level changes, and in this example, the radial width of each pit in this pit string that is illustrated by the broken lines is greater than or less than the width of each normal pits, and is as shown in the drawing.Figure 17 (B) has shown the waveform because of the RF signal of the pit generation of Figure 17 (A).That is, the RF signal corresponding with normal pits have one as among Figure 17 (B) by the waveform of curve GH indication, and have a layering level SL1.Yet under the situation of a radial width greater than the thick pit of the radial width of normal pits, volume reflection is big, so it is big that modulation factor becomes.Therefore, have one by the represented waveform of curve GI among Figure 17 (B), reduce to SL2 corresponding to the layering level of this pit corresponding to the RF signal of this pit.Under the situation of radial width less than the pit of the width of normal pits, modulation factor diminishes, as curve GJ indication.In addition, corresponding with this pit layering level increases.Form if having the irregular pit compartment of terrain of different in width like this, its signal level narrowly layering level corresponding with normal pits compared and become broken line.
2) replay device
Below with reference to Figure 18, Figure 20 (A), Figure 20 (B) and 20 (C) describe the replay device that utilizes RF signal symmetry check illegal copies dish in detail.Figure 18 has shown the structure of this replay device, and as can be seen from this figure, in this device, symmetry change detecting circuit (below be sometimes referred to as RF symmetry change detecting circuit) 80 is configured to the pulse tracking error-detector circuit 42 that replaces among Fig. 9.In addition, all the other component parts of this replay device are similar with the corresponding component part among Fig. 9.RF symmetry change detecting circuit 80 receives the RF signal from RF treatment circuit 34, the symmetry that detects its layering level changes and will represent that the detection signal of testing result delivers to microcomputer 40.
Figure 19 has shown the structure of RF symmetry change detecting circuit 80.As shown in the drawing, the RF symmetry changes testing circuit 80 and is furnished with the circuit that is called AUTOMATIC ZONING circuit 80A, a benchmark output circuit 80B, a comparer 80C and an one shot multivibrator 80D.In general, the RF signal has an analog waveform.When the RF conversion of signals is become logic level, even because of pit (promptly, because of irregular pit) shape and arrangement make the RF signal (promptly with respect to the symmetry disappearance of its center signal level, the waveform of RF signal becomes asymmetric with respect to its center signal level) situation under, the center signal level of the layering level being adjusted to the RF signal is necessary.AUTOMATIC ZONING circuit 80A is used to obtain a such layering level through adjusting.
The operation of this device is described to 20 (C) below with reference to Figure 20 (A).When reading Figure 15 (A) to the irregular pit string of 15 (C) or Figure 17 (A) and 17 (B), " eye " of RF signal moves up or down, as shown in figure 16.This is detected by AUTOMATIC ZONING circuit 80A.Figure 20 A has shown the example of variation of the layering level of RF signal.
Next, the layering level is compared by comparator circuit 80C and layering level layered values SLL1 from Figure 20 A of benchmark output circuit 80B output and SLL2.As a result, the layering level variable signal shown in Figure 20 B is exported from comparator circuit 80C.This signal is sent to monostable multi-resonant circuit 80D, thereby a time constant offers this signal, shown in Figure 20 C.Generally speaking, this layering level changes very fast.Owing to provide a time constant, part continuity a period of time with layering level of this signal is so microcomputer 40 can detect a such layering level.
The irregular pit of record is similar to the corresponding operating of foregoing embodiment with the basic operation of the irregular pit that detects this record in the predetermined road of dish.Therefore, the method with shown in Figure 13 is identical basically to be used to detect the method for irregular pit.In the situation of this replay device, the variation in the layering level of RF signal is detected in step S8.The detection of the irregular pit that is undertaken by microcomputer 40 is similar to as among Figure 12 (E) regularly.Promptly at time QC, the variation of the layering level of RF signal is detected, rather than detects tracking error.
The concrete instance of the AUTOMATIC ZONING circuit 80A of Figure 19 is " TC9263F " that Toshiba produces, the signal of an indication of this circuit output layering level.In addition, when the waveform of RF signal was asymmetric with respect to its center line, a simulating signal that is applicable to the layering level of RF signal asymmetric waveform obtained from this IC.
In the situation of the replay device of present embodiment, similar with the 3rd embodiment, the asymmetric waveform of RF signal can not be copied.Therefore, under the situation of illegal copies dish, its layering level does not change, and similar to aforesaid embodiment, this illegal copies dish can be excluded.
3) pen recorder
Below with reference to Figure 21 and 22 describe in detail be used to obtain a CD the present embodiment pen recorder (promptly; the stamper machine) as shown in figure 21; for example be used to protect that the numerical data of Games Software is imported into an EFM scrambler 50, this scrambler becomes data-switching the EFM signal and exports this EFM signal.On the other hand, EFM is imported into a subcode reader 56 and a duty factor correcting unit 82.Subcode reader 56 extracts subcode signal in the middle of the EFM signal, this subcode signal is imported into CPU58 and gate signal generator 60.
In addition, CPU58 monitors the address information of being represented by subcode signal continuously, and when subcode signal begins to represent the predetermined address of sign indicating number that should record protection, produces and export a control signal.This control signal is imported into gate signal generator 60.When CPU58 receives control signal, gate signal generator 60 produces a gate signal synchronous with sub-code frame.Figure 22 (A) has shown this operation to 22 (C).Figure 22 (A) has shown frame number, and Figure 22 (B) has shown the waveform of control signal; Figure 22 (C) has shown the waveform of gate signal.
This gate signal is corresponding to a protected code.When sub-code frame is, for example during an odd-numbered frame, gate signal has the low-signal levels corresponding to logical value L, and when sub-code frame was an even frame, gate signal had the high signal level of a counterlogic value H.Obviously, when sub-code frame was odd-numbered frame, gate signal also can have the high level corresponding to logical value H, and when sub-code frame was even frame, gate signal also can have the low level corresponding to logical value L.Such gate signal is imported into duty factor correcting unit 82.When gate signal has high level H (that is, the situation of even frame), duty factor correcting circuit 82 is carried out predetermined duty factor and is proofreaied and correct, yet, when gate signal has low level L (that is, the situation of odd-numbered frame), duty factor correcting unit 82 is not carried out this duty factor and is proofreaied and correct.Then, utilize the tracer signal of proofreading and correct to be delivered to output modulating driver 52 from duty factor correcting unit 82 with this method.In addition, the optical modulation drive signal from driver 52 outputs is imported into photomodulator 54.
On the other hand, laser La from laser oscillator 68 from shining laser modulator 54 continuously.Like this, when laser La process photomodulator 54, laser La is subjected to and the corresponding modulation of optical modulation drive signal.Thereby, obtain the time-varying laser Lb of intensity.This laser Lb is radiated stamper 72 from this by object lens 70 becomes a little point, the result, and as Figure 15 (A), 15 (B) are formed with the pit pattern with different duty factors shown in 15 (C) and 22 (D).
The layering level of the RF signal of resetting from such dish synchronously changes with data block number among Figure 22 (A) shown in Figure 22 (E).If it is detected to detect the signal (shown in Figure 22 (F)) that is illustrated in this variation in the layering level, this dish is normal disk, otherwise this dish is the illegal copies dish, thereby illegal copies can be prevented from.
(embodiment 5)
1) CD
Describe the fifth embodiment of the present invention below in detail.This embodiment utilizes the variation of the light quantity that CD reflects.
At first, the shape of the pit that forms in 5 (D) and Figure 23 (A) and 23 (B) description dish with reference to Fig. 5 (A).In this embodiment, Fig. 5 (A) arrives the pit of Fig. 5 (B) as irregular pit, and its reflected light changes on light quantity.In the example of Fig. 5 (A), the pit PA in left He You district is a normal pits, and the pit PB of center is irregular pit, and the length of its each pit is set to and is shorter than according to the predetermined length of modulating rule.In addition, in this example of Fig. 5 (B), do not form pit in the center, and be to use and the similar minute surface mark P E of irregular pit.In the further example of Fig. 5 C, pit PF is shallow (or thin) and less than normal pits.In the middle of each figure, by the light quantity that reflected of dish, comparing with the light quantity of the dish reflection of having only normal pit increases.
Figure 23 (A) and 23 (B) have shown other the example of shape of pit of this embodiment.In Figure 23 (A), the pit that the center FR on this dish forms, each all has normal width.The waveform of the signal that these pits are reset is shown in Figure 23 (B).That is, relatively large corresponding to the volume reflection of this signal section on the top of its waveform, less relatively corresponding to the volume reflection of this signal section of the bottom of its waveform.
The width of the irregular pit of the district of Figure 23 (A) or section FS is than long width 2a of width of the normal pits of district or section FR.In this case, shown in Figure 23 (B), compare with the situation of the signal that produces from normal pits, it is big that the amplitude of replay signal becomes, and total volume reflection reduces.Similarly, the width of the irregular pit of the district of Figure 23 (A) or section FT is than the little width 2b of width of the normal pits of district or section FR.In this case, as shown in Figure 23 (B), comparing its total volume reflection with the signal that normal pits is reset increases, and still, the amplitude of replay signal reduces.
2) replay device
To 5 (F), Figure 24 and Figure 25 describe the replay device that variation in the light volume reflection that utilizes regular concave never detects CD in detail below with reference to Fig. 5 (A).Figure 24 has shown the structure of this replay device.As can be seen from the figure, this device is equipped with a light quantity change detecting circuit 90 to replace the pulse tracking error-detector circuit 42 of Fig. 9.All the other component parts and the appropriate section among Fig. 9 of this replay device are similar.
In addition, the structure of described light quantity change detecting circuit 90 as shown in figure 25, and the light amount signal addition that in totalizer 90A, will provide from servo processing circuit 36.In the middle of reality, will be in totalizer 90A from the light amount signal addition (E+F) of the output of photodetector E and F (corresponding to the addition of side beam) or from photodetector A, B, the light amount signal addition (A+B+C+D) of C and D output (corresponding to the whole addition of the output of four sections sensors of main beam).The output signal of representing the totalizer 90A of this addition result is exactly the light quantity variable signal.Then, this light quantity variable signal and the signal from the representative reference value VT of benchmark output circuit 90C output compare.Next, indicated value is sent to microcomputer 40 greater than the light quantity variable signal of reference value.
Corresponding to Fig. 5 (A), the light amount signal of the pit string of 5 (B) or 5 (C) has the waveform shown in Fig. 5 (D).When this light amount signal process totalizer 90A, its bandwidth and response speed are lowered, and the signal that obtains as addition (E+F) result has the waveform shown in Fig. 5 (E).In addition, have only when when big, just obtaining having the light volume reflection variable signal of the waveform shown in Fig. 5 (F) through the light volume reflection that obtains for a long time.
The irregular pit of record is similar to the corresponding operating of foregoing embodiment with the basic operation of the irregular pit that detects this record in the predetermined road of dish.Therefore, the method with shown in Figure 13 is identical basically to be used to detect the method for irregular pit.In the situation of this replay device, the variation of reflection light quantity is detected in step S8.Similar among the timing of the irregular pit detection of being undertaken by microcomputer 40 and Figure 12 (E).Promptly at time QC, the variation of reflection light quantity is detected, rather than detects tracking error.
By this way, the replay device according to present embodiment has utilized the light quantity that is reflected by dish.If the length of pit is suitably reduced, the optical disc data that comprises this pit can be corrected, and the data of correction can be copied into a CD-WO and output error signal not.Irregular pit with aforementioned shapes can not be copied on this CD-WO dish.Therefore, in this dish, do not have reflection light quantity to change and produce, so this dish can be excluded.If the size of each irregular pit is done greatlyyer, when attempting from the CD-WO with this irregular pit replay data, a data rub-out signal of replay device output also stops replay operations.In addition, the district of containing this irregular pit can not be copied into this CD-WO.As a result, similar with aforesaid embodiment, the illegal copies dish can be excluded.
3) pen recorder
Describe the pen recorder (that is stamper machine) that obtains a present embodiment CD in detail to 27 (F) below with reference to Figure 26 and Figure 27 (A).As shown in figure 26, for example be used to protect that the numerical data of Games Software is imported into an EFM scrambler 50, this scrambler becomes data-switching the EFM signal and exports this EFM signal.On the one hand, this EFM signal is imported into the first optical modulation driver 92 of output first an optical modulation drive signal, and this first optical modulation drive signal is imported into one first photomodulator 94.On the other hand, EFM is imported into a subcode reader 56.Subcode reader 56 extracts subcode signal in the middle of the EFM signal, this subcode signal is imported into CPU58 and gate signal generator 60.In addition, CPU58 monitors the address information of being represented by subcode signal continuously, when subcode signal begin to represent should the record protection sign indicating number presumptive address the time, produce and export a control signal.This control signal is imported into gate signal generator 60.When CPU58 receives control signal, the gate signal generator produces a gate signal synchronous with sub-code frame.Figure 27 (A) has shown this operation to 27 (C).Figure 27 (A) has shown frame number, and Figure 27 (B) has shown the waveform of control signal; Figure 27 (C) has shown the waveform of gate signal.
This gate signal is corresponding to a protected code.In addition, this gate signal has and the corresponding level of the logical value of odd-numbered frame and even frame, and is similar with aforesaid embodiment.In addition, this gate signal is imported into second an optical modulation driver 96 to second photomodulator, 98 outputs, the second optical modulation drive signal.
On the other hand, laser La shines on first laser modulator 94 continuously from laser oscillator 68.Like this, as laser La during at first through first photomodulator 94, laser La is subjected to and the corresponding modulation of the first optical modulation drive signal.Thereby, obtain the time-varying laser Le of intensity.As laser Le during through second photomodulator 98, laser Le stands the signal modulation corresponding with the second optical modulation drive signal.So, obtain laser Lf.Laser Lf is radiated stamper 72 from this by object lens 70 then becomes a little point, the result, and the pit pattern with different in width shown in Figure 27 (D) is formed.
Therefore, if the pit with different in width is arranged in shown in Figure 27 (D) corresponding to the gate signal with number synchronous Figure 27 (C) of the piece of Figure 27 (A), promptly obtain having the RF signal of the playback of waveform shown in Figure 27 (E).Therefore, the envelope of the waveform of the signal of this playback and piece number synchronously variation up and down.If the signal that detects this envelope variation of representative is shown in Figure 27 (F), then this coils and is normal disk, otherwise this dish is judged as the illegal copies dish, thereby similar with aforesaid embodiment, illegal copies can be prevented from.
When most preferred embodiment of the present invention is described, should understand that the present invention has more than and is limited to these embodiment, to one skilled in the art, other improvement is conspicuous, and does not break away from spirit of the present invention.For example, following improvement is conspicuous to one skilled in the art.
(1) in the embodiment described above, to be formed with the information of address of irregular pit be to be stored in the pick-up unit in advance in expression.Yet in improvement, this information is the precalculated position that is stored in dish.After dish was placed into, pick-up unit was at first read this presumptive address of (or visit) dish.Thereby this address that is formed with irregular pit can change according to the dish kind.Therefore the Copy Protection of being utilized in the analysis disc becomes more difficult.As a result, illegal copies can effectively be avoided.
(2) in addition, therefrom obtain the irregular pit of first embodiment of tracking error and the irregular pit that therefrom obtains second embodiment of light amount signal and can coexist as same CD.Thereby, detect illegal copies dish reliability and more improve.
(3) according to common standard (for example, JIS (Japanese Industrial Standards) S8605), error can not exceed predetermined scope.But, as mentioned above, the length of each pit, swing degree, the variable quantity of the symmetry of RF signal and RF volume reflection can be changed to the degree of error within predetermined scope that make.In this case, irregular pit does not become the obstacle of dish.
(4) in addition, in computer game and area of video games, concerning the dish of a storage computation machine game program, unnecessary by the device playback beyond the device of special this dish of playback.Therefore, the dish of storage computation machine game program does not need compatible mutually with the dish that is used for personal computer or similar devices.That is, even the dish of storage computation machine game program is incompatible with the dish that is used for personal computer, actually also without any inconvenience.
(5) in the foregoing embodiments, after dish is put into device, judge at first whether dish has irregular pit (that is, whether this dish is the illegal copies dish).But this judgement also can be made (for example, when sending the instruction of replay data from this dish) in other suitable time.
The irregular pit string of the random arrangement among (6) first embodiment can replace to the irregular pit string as the periodic arrangement among the 3rd embodiment.Even improve through this, also can obtain identical effect.In addition, the three, the by or the 5th embodiment in the irregular pit string of periodic arrangement can replace to random arrangement among first embodiment, can obtain similar effect equally.
Scope of the present invention is sincerely determined by appended claims.

Claims (18)

1. CD comprises:
The pit string of the rule of the spiral of predetermined number, the pit of the pit string that each is regular is with respect to the center symmetric offset spread of session; And
At least one irregular pit string, the pit of irregular pit string is same as the center symmetric offset spread of session, each irregular pit has the reservation shape different with each regular concave, the arrangement of irregular pit string is different with the arrangement of each regular concave string, irregular pit string has the information that causes tracking error signal, and light amount signal changes because of irregular pit string.
2. according to the CD of claim 1, wherein irregular pit string is swing shape with respect to session arranges, and the symmetry of the waveform of RF signal changes because of irregular pit string.
3. according to the CD of claim 1, the pit string of wherein irregular pit string and rule is arranged with the time cycle that replaces corresponding to given data block on given session, make that irregular pit string is arranged off and on, and irregular pit string has the information that produces tracking error signal.
4. pick-up unit, be used to detect the pit string of a rule that comprises a plurality of spirals and the CD of at least one irregular pit string, the pit of the pit string of the rule of each is with respect to the center symmetric offset spread of session, each irregular pit has the reservation shape different with each regular concave, the arrangement of irregular pit string is different with the arrangement of each regular concave string, this pick-up unit comprises a replay device, is furnished with the zone of irregular pit string with resetting; This replay device comprises:
Pick device (16,32), the zone that is used for irregular pit string place on CD applies laser beam, be used to detect the folded light beam from the CD, convert beam reflected the replay signal of irregular pit string zone of living in to, and export the signal of this playback;
Signal processing apparatus (22,34,36,38,42,80,90) is used for producing detection signal from the replay signal that pick device is exported, and this detection signal is corresponding to irregular pit string; And this pick-up unit also comprises:
Whether judgment means (24,40), the detection signal detection that is used for producing according to signal processing apparatus exist irregular pit string and judge that according to the relevant testing result of irregular pit string that whether exists detected CD is the legal dish or the dish of bootlegging.
5. pick-up unit according to claim 4, wherein said replay device comprise a decoding unit, are used for decoding from the information recording part branch read data piece of CD and to data block, and wherein said judgment means (24,40) comprising:
One first detecting unit is used to detect a servosignal or data-signal and is normally or undesired;
One second detecting unit, whether mutually the output signal that is used to detect the output signal of decoding unit and first detecting unit in predetermined regular time point simple crosscorrelation; And
A judging unit, be used for judging whether to detect the irregular pit that is recorded in advance on the CD from the detection signal that second detecting unit is exported, thereby, for each detected CD, can determine one only the CD of regular pit the CD that is recorded in the irregular pit on the CD is in advance still arranged.
6. pick-up unit according to claim 5 also further comprises a tracing error signal detector, is used for tracking error signal;
Whether one the 3rd pick-up unit, the signal level that is used to detect tracking error signal be near constant or resemble and change the pulse signal;
A control module, be used for judging on the CD of reading whether have irregular pit to be detected, after judgement is made, start replay operations from tracking error signal, thereby whether each CD can exist on the basis of irregular pit identified.
7. pick-up unit according to claim 6, wherein said pick device has adopted a kind of three point-tracking methods, described the 3rd detecting unit comprises a bandwidth-limited circuit, a rectification circuit and a comparator circuit, the centre frequency of described bandwidth-limited circuit is to set like this, in this frequency, the level of the pulse signal in the tracking error signal becomes maximum and the leakage of the data-signal that occurs in the tracking error signal becomes minimum.
8. pick-up unit according to claim 4, wherein said judgment means also comprise one the 3rd detecting unit, are used to detect the symmetry of the waveform of a RF signal with respect to the layering level of RF signal; A layering level changes the unit, is used for changing according to detected symmetry the layering level of RF signal; A comparing unit, whether the change that is used for determining described layering level is within reference range; A judging unit is used for judging the CD of reading whether detect irregular pit from the output signal of this comparing unit, thereby whether each CD obtains identification on the basis of regular pit.
9. pick-up unit according to claim 4 also has a light volume reflection signal generation unit in the wherein said judgment means, be used for information recording part to CD and divide radiation laser and export one and represent CD reflection amount light volume reflection signal; Whether a comparing unit is used for determining in the change of light volume reflection in reference range; An expanding element is used to expand the output signal of comparing unit; A judging unit is used for judging the CD of reading whether have irregular pit to be detected from the output signal of expanding element, thereby whether each CD can have on the basis of irregular pit and obtain identification.
10. pick-up unit according to claim 4, wherein said judgment means also comprise one the 3rd detecting unit, be used for reading the data of each the predetermined address record of data block that on CD, writes down, and by determining whether to resemble tracking error signal that changes and the regular time point of determining according to the data of the address record of being read synchronously are detected the pulse signal, or whether synchronously detect with regular time point by the change of the layering level determining to obtain according to the symmetry of layering level RF signal waveform relatively, or by determining whether synchronously to detect with regular time point by the change of the light quantity of CD reflection, whether judgement has irregular pit to be detected on CD, thereby whether each CD can have and obtain identification on the basis of irregular pit.
11. pick-up unit according to claim 4, wherein said judgment means comprises one the 3rd detecting unit, be used for reading the data of each predetermined address record of the data block that on CD, writes down, if the tracking error signal of judging more than pre-determined number that changes as pulse signal synchronously is detected with the regular time point of determining according to the data that write down in the address of being read, or synchronously be detected according to the change and the regular time point of the corresponding signal level of symmetry of relative layering level RF signal waveform, or synchronously be detected by change in the CD reflection light quantity and regular time point, if and the tracking error signal of judging more than pre-determined number that changes as pulse signal with according to the regular time point of determining in the data of reading address record synchronously is not detected, or the change of the layering level that obtains according to the symmetry of relative layering level RF signal waveform synchronously is detected with regular time point, or synchronously be detected by the change and the regular time point of the light quantity of CD reflection, then judging has irregular pit to be detected in dish.
12. pick-up unit according to claim 4, wherein said judgment means comprises a storage unit, be used for the presumptive address of store storage in the data block of CD, this data block is used for determining optical disc types according to the judged result whether information pits that forms has irregular pit to be detected on dish, and one the 3rd detecting unit, be used for when packing CD into, reading data block at the presumptive address record, and in data block, be detected by determining whether to resemble the tracking error signal that changes the pulse signal, or whether in data block, be detected by the change in the layering level of determining the RF signal, or whether in data block, be detected by the change in the level of determining light volume reflection signal, whether judge on dish has irregular pit to be detected, thereby whether each CD can have and obtain identification on the basis of irregular pit.
13. pick-up unit according to claim 4, wherein said judgment means comprises a storage unit, be used to store a predetermined address, in this address, the address table of data block is stored on the CD, this data block is used for determining optical disc types according to the judged result that whether has irregular pit to be detected in the information pits that forms on CD, and one the 3rd detecting unit, be used for when packing CD into, reading described table at presumptive address, then, read when the setting CD address institute data blocks stored listed in table, and in data block, be detected by determining whether to resemble the tracking error signal that changes the pulse signal, or whether the change of the layering level by determining the RF signal is detected in data block, or whether the change of the level by determining light volume reflection signal is detected in data block, or whether the change of the level by determining light volume reflection signal is detected in data block, whether judge on dish has irregular pit to be detected, thereby whether each CD can have and obtain identification on the basis of irregular pit.
14. information record carrier, be used for CD identifying recording layer in pit string and at least one irregular pit string of a rule that comprises a plurality of spirals, the pit of the pit string of the rule of each is with respect to the center symmetric offset spread of session, it is different that each irregular pit has the arrangement of the arrangement of the reservation shape irregular pit string different with each regular concave and each regular concave string, and this pen recorder comprises:
Laser light-source device (68) is used for producing and output laser;
Chromacoder (50) is used for converting digital signal to modulation signal;
Laser Modulation device (53,54) is used for according to modulation signal the laser of exporting from LASER Light Source being carried out intensity modulated;
Gate signal generation device (56,58,60), be used to produce one with the synchronous gate signal of representing by modulation signal of each data block;
Laser modifier (62,64,66,82) is used for synchronously changing laser with gate signal, makes it corresponding with irregular pit string;
Laser irradiation device (70) is used for shining the laser of being modulated and being changed by Laser Modulation device and laser modifier respectively to CD, forms pit string on CD.
15. according to the information record carrier of claim 14, wherein the laser beam modifier is included on the given session with corresponding to the cycle that replaces of the data block of modulation signal and the device that gate signal synchronously changes irregular pit string and regular concave string.
16. information record carrier according to claim 14, wherein the laser modifier comprises a device (62) that is used to produce with the synchronous swinging signal of described gate signal, be used for upwards changing in the footpath of CD the device (62 of the laser beam on laser disk according to described swinging signal, 66), make irregular pit string with respect to the swing of session center, and never the symmetry of the signal of regular concave string playback is changed.
17. according to the information record carrier of claim 14, wherein the device (82) that the laser modifier comprises with described gate signal synchronously changes the duty factor of modulation signal makes that the length of the length of irregular pit and regular concave is different.
18. information record carrier according to claim 14, wherein the Laser Modulation device comprises the device (96 that is used for synchronously changing with gate signal the change laser intensity of the modulation that is subjected to modulation signal, 98), make the pit width of irregular pit string radial direction be different from the pit width in the radial direction of regular concave string.
CN94104669A 1993-07-29 1994-04-25 Optical disc, device for checking optical disc and device for recording information on optical disc Expired - Lifetime CN1035792C (en)

Applications Claiming Priority (4)

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JP5207136A JP2806219B2 (en) 1993-07-29 1993-07-29 Optical disk and check device thereof
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EP0637023B1 (en) 2002-08-28
TW241360B (en) 1995-02-21
KR0153225B1 (en) 1998-12-15
CN1100549A (en) 1995-03-22
US5696757A (en) 1997-12-09
DE69431225T2 (en) 2003-03-20
HK1003095A1 (en) 1998-10-09
ATE223103T1 (en) 2002-09-15
SG42776A1 (en) 1997-10-17
KR950004248A (en) 1995-02-17
DE69431225D1 (en) 2002-10-02

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